Improvement in steam vacuum-pumps



W. V. DUBOIS. STEAM VACUUM PUMP.

No.181,6-5Z. Patented Aug.29, 1876.

monuns.

NFETERS. PHOTO-LITHDGRAPMER. WASHINGTON, D U,

PATENT OFFICE,

WILLIAM V. DUBOIS, OF OOVINGTON, INDIANA.

IMPROVEMENT IN STE Specification forming part of Letters Patent No. 1July 11 AM VACUUM-PUMPS.

81,652., dated August 29, 1876; application filed ,1876.

To all whom it may concern Be it known that I, WILLIAM V. DUBoIs, ofOovington, in the county of Fountain and State of Indiana, have inventeda new and Improved Vacuum-Pump, of which the following is aspecification:

My invention relates to the construction and arrangement of theworking-chambers, air-chambers, and valves, and particularly to thecontrivance of the valve for changing the admission of steam to theworking-chamber, and to a vacuum-chamber for relieving the jar at thefootvalve in the end of the pipe in the wall.

Figure l is a sectional elevation of improved vacuum-pump, taken on theline 00 a: of Figs. 2 and 3. Fig. 2 is a plan of the inverted middlesection of the pump. Fig. 3 is a plan of the base-section, and Fig.et-is a section of the top of the pump.

Similar letters of reference indicate correspondin g parts.

A is the base-section of the pump, mounted on legs B of any approvedform, and having the suction-inlet 0 made in the middle of it; also, adischarge-pipe, D, for the water, if desired; or the discharge may be atthe top E. On the top of this base-section. are clackvalves F, admittingwater from the suction into the working chambers G, and from the base ofthese chambers some of the water is forced by the steam through theclack-valves 1 into the air-chamber J, while the rest isforced throughvalves K into the dischargechamber L, from which it may escape eitherthrough the port D or E, one being plugged up when the other is used.Steam enters the Working-chambers from the chest M through ports N,being cut off from one and let into the other by the double-rockin gclack-valve O. P represents jet-pipes from the air-chamber J into theworking-chambers, to condense the steam and make the vacuums. The vacuumin one chamber holds the valve 0 down on that. side, and admits steaminto the other chamber containing water. The steam forces the water outthrough chamber L, and also passes some of itinto the air-chamber Jagainst the airspring therein. When the water is all forced out, and thesteam finds full exit by the valve K, the pressure so diminishes thatthe airspring throws a jet into the empty chamber G, condensing thesteam and forming a vacuum therein, which reverses the valve 0, so thatthe empty chamber fills, and the full one empties. The valves F and Kare in this case pivoted by connection with a rubber disk, R; but,inpractice,I propose to arrange them with pivot-studs, one at each side,to be secured by staples titted in the bed or seat. S is avacuum-chamber, connected at T with the suction-pipe, to cushion thewater and prevent jar at the foot-valve by the changes of the suctionfrom one chamber toanother.

Having thus described my invention, I claim as new and desire to secureby Letters Pat ent 1. In a vacuum-pump, the combination of theworking-chambers G, air-chamber J, discharge-chamber L, jet-pipes P,vacuum-chamber S, valves F I K, and the double-rocking clack-valve 0,arranged in chamber M, located at the top of the cylinder, and havingports N, all constructed and arranged as shown and described, to operateas specified.

2. The curved rocking valve O, in combination with the ports N ofworking chambers G G, said valve working in a horizontal seat, as shownand described, for the purpose specifled.

' WILLIAM V. DUBOIS.

Witnesses:

GEORGE W. MERRYMAN, THOMAS W.-MCGLURE.

